To be fair, Bose does make pro audio systems that many pro touring acts use for mid size venues. http://tiny.pl/1zqx
Not to mention permanent installs.
I saw Disney on Ice a few years ago at good size auditorium that is also used for pro hockey, and Disney was using Bose speakers hanging from the ceiling.
The L1 personal amplification system, I believe is a way to take that technology and make it portable.